A fair coin with sides marked heads and tails is to be : Quant Question Archive [LOCKED]
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 18 Jan 2017, 00:03

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# A fair coin with sides marked heads and tails is to be

Author Message
Intern
Joined: 03 Apr 2006
Posts: 46
Followers: 0

Kudos [?]: 21 [0], given: 0

A fair coin with sides marked heads and tails is to be [#permalink]

### Show Tags

09 Jun 2007, 15:33
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

A fair coin with sides marked heads and tails is to be tossed eight times. What is the probability that the coin will land tails side up more than five times?

a) 37/256
b) 45/256
c)23/256
d) 70/ 256
e) 81/ 256
Director
Joined: 13 Mar 2007
Posts: 545
Schools: MIT Sloan
Followers: 4

Kudos [?]: 70 [0], given: 0

### Show Tags

09 Jun 2007, 15:53
(A)

t>5

i.e t = 6 or 7 or 8

prob(t=6) = 8C6 (1/2)^8

prob(t=7) = 8C7 (1/2)^8

prob(t=8) = 1

= 37/256
09 Jun 2007, 15:53
Display posts from previous: Sort by